Gyeus fbwhall



Leners Paten; No. 79,381, tantrum so, 1868.`

iMPnovsMsNT 'IN Toon-nner sonV sNeINs-LATHBS.

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tite tlntnlt referrer tu in tinte 'Entert if 'T01 ALL WHOM IT. MAY CONCERN: :I Beit k'nown that LCRUS NEWHALL, of yHinsdale, in the county of Cheshire, and vState of NewHampshire, `have invented certain new and useflil Improvements in Tool-Rests for Engine-Lathes, of which the following is -a full, clear, and exact description, reference being had to the accompanying drawings, which make part of this speciication,' and in which- Figure '1 represents a plan or'top viewof myimproved tool-rest.

Figure 2 represents a view in elevation of `one side of the same, partly insection, at the line a :b of iig. '1f Figure 3 represents a similar view of the same, as seen from the rear, partly in section at the line c d of fig. 1'; and I l I Figure 4 represents a vertical section through the same at the line y y of tig. 1.

The objects of my improvement are to easily 'adjustthe-'cutting-tcol of an engine-lathe tothe work to be done, and also to,V compensate for thel wear of the working parts of the tool-rest; to which ends the improve-l ments herein claimed consist- First, in a novel method' of mounting the cutting-tool of an engine-lathe in a tool-post supported in a rocking-block hinged to the slide-plate by a pivot arranged centrally heneaththe block, parallel to the axis of the lathe, and directly beneath the tool-post, suhstantially'as hereinafter set forth. v Second, in a novel method of combining, with a tool-support, rocking on a hinge parallel with the axis ot' rotation of the lathe, and in therv same vertical plane-as the tool-post, a device for adjusting 'and holding the point of the tool in., a.ny position desired.- 5

'.lhird, in a novel method of combining, with a rocking-tool support, a device fortightening the joints of the hinge on which the tool-post rocks, te compensate forits wear. i

Fourth, in a ncvelmethod of compensating for the wear of thejoints of the device by which `the cuttingtooi'isadjusted and heidi@ poseen.

l Fifth, in a novel method of constructing the sockets of the adjusting-screw.-

In turning iron `and other metalsin an engine-lathe, the working joints are necessarily subjected t o a heavy strain, which causes them to wearunequally.l In' my efforts to compensate for this wear, I found it necessary to remodel the tool-rest usually employed.

To carry out the objects-of my invention, I construct the tool-rest Vinthree pieces First,-a sliding plate, having the usual vmotionsvon fhelatlie-bed; second, a. block, rocking on along hinge er bearing parallel'to the axis of thev lathe; and third, a tool-post, sliding :and-turning freely in the. usual way in'aslot in the rockingblock. f

'The wear ofv thehinge of-thc rocking-block is compensated by tightening the eye-bolts whichconnect the block with its pivot. l i

The angle o f the tool-post is adjusted by a'right-and-left screw, one end. of'which enters a socket on the l slide-plate, and the other a corresponding socketon the rocking block.A 'lhe wear-of this screw in itssockets is Ataken up by wedges, forming a part of the sockets in which the screws work, which wedges are tightened by pinchscrews in the. sockets These sockets are mounted on 'the ends of tapering' spindles, passingl through tapering holes in brackets on the slideplate and rocking-block, and the wear on these spindles is compensated by nuts,.'screwing on their ends. By .thismeans the toolis held rigidly up to its work, and that wahbling of the tool', so fatal to accurate work, prevented.

In the accompanying drawings, whichshow one practical way of carrying out the objects of my invention, E represents the slide-plate of an engine-lathe, havingthe usual longitudinal and'transversc movements on the bed-plategrelatively to the axis of rotation of the article to be turned. v

A. Ysemi-'cylindrical bearing, e, is formed on this slide-plate, parallel tothe axis of 'the;lathe,`it forma iirm support fora rocking-block, Frliavi'ng a. concave bearing, f, on its under -side tot 1 the kother bearing e; the

bottomof the block being bevelled off suiciently to allow it to rock through an arc suiiicient to give the required range of movement to the cutting-point of the tool.

, Two eye-bolts, f1, enter sockets inthe vslide-plate E, and are secured by a pin, e', passing through them and through the slide-plate. i'lhe spindles of these eye=bolts passup through the rocking-block, and have screws on them to receive the jam-nuts f2, which can be screwed up tighter as the bearings efwear away by use.

A'tool-post, Gr, is mounted in the usual way, to traverse longitudinally in a. slot, g, in the rocking-block, and also to turn on its own axis. The slotg is parallel with and directly over the pivot eof the rocking-block. By arranging the pivot of the rocking-block directly below the tool-post; as above described, the tool, inv cutting, acts with a .compressing fdrceon the rocking-block, thus causing'it to rest firmly in-its bearings on the bed-plate without straining its hinge, which would not be the case were the joint backvof and on the same level, or nearly so, as the cutting-tool. l

Moreover, asthe cutting-tool is on one side of the central pivot, and the device for adjusting and holding the block on the other, the adjustments desired can be eected with a smaller range of movement ofthe adjustingdevices than could be effected were the, hinge at the back of the block, and both the cutting-tool and adjustingdevices on the same side of the block.

A ciitting-tool, H, of any well-known proper form, is inserted in a slot, h, in the tool-post, and both thev tool and p ost, when adjusted for work, are clamped in position by a set-screw, h', las usual.

' The cutting-point' of the tool4 is raised or lowered by means of a right-and-.left screwed spindle, J, the upper end of which works in a socket, z', on one end of a tapering spindle, I, which passes through a hole of `co rrespond, ing shape in a bracket, F,fprojecting from the rocking-block F'. As this spindle wears loose in its socket, itis 'tightenedup by means ofjam-nuts, i', on the small end of the spindle. The lower end of the spindle J works in a. socket inv a spindle, I, passing through a bracket,iE, on the slide-rest, the connection and adjustment'being the same as that above described,except that there is a. recess, j', in the slide-plate, into which the .bottomof the screw J may ent'er when required. To compensate for the wearof the screw-J in the sockets, wedge-blocks, k, are inserted in the socketsrand have-screw-threads cut on -them,so that they form part of thel female screws in whichthe spindle J works.- These blocks have lips or iianges on them to overlap the top and bottom of their sockets, and thus lock'jthem in place, and are tightenec` onthe spindle by pinch-screws, k.

It will thus be seen, that by myA improvements the tool is 'capable of all the usual adjustments, can be held firmly in any desired position, and that any wear on the workingjoints can readily be compensated; thus preventing any tremor in vthe cutting-tool. l v

The operation of the device will be obvious from the above description.

I am aware that it is not new to vary the inclination of a cutting-tool by rocking the t'oolypost, and do not, therefoie, broadly claim such. operation. v 4

What I claim as my invention, and desire to secure by Letters latent, is

1 The combination, substantially as set forth, of the slide-plate E-with the rockingblock F, rocking-on aK central hinge directlyv underneath and parallel withthe slot in which the tool-post traverses, for the purposes y specified..

2The combination, substantially as set forth', of the slide-,plate E and rocking-block, with the adjustingscrew J and its pivoted socketst' 3. The combination, as set forth, of the slide-plate E, the rockingblock,'the. bearing e, the hinge e', the eye-bolts, and the jam-nuts, whereby the wear of thejoints is compensated. v

dles -I, constructed, arranged, and

f 4. The `combination, with the brackets F E', ofthe tapering spin operating as described.

5. The 4combination of the adjusting-screw J with the swivelling-spiudles I I', wedge-blocks k, and pinchscrews c, all constructed Iand arranged for joint'operati'on', as described. f Y f Y In testimonywhereol have hereunto subscribed my name. v

' Y CYRUS NEWHALL.

Witnesses:

E.?M. FORBES, W. N. WooDwARD. 

